In the future year 2040, where motorized vehicles are being replaced by their anti-gravitational counterparts. The last domestic motorcycle manufacturer in the country is Corley Motors, whose founder and CEO, the elderly Malcolm Corley (Hamilton Camp), is en route to a shareholders meeting at the Corley factory, accompanied by his vice president, Adrian Ripburger (Mark Hamill).
Malcolm suspects that Ripburger is scheming to take over the company, and is suspicious of Ripburger’s plan to recruit a biker gang to ride with them to the meeting. Malcolm’s limousine is overtaken by one such gang, the Polecats, and he is immediately impressed with them. Catching up to them at a biker bar, he quickly befriends their leader, Ben (Roy Conrad). Ripburger offers to hire the Polecats to escort Malcolm to the meeting, but when Ben declines, he is knocked out by Ripburger’s flunkies, Bolus (Jack Angel) and Nestor (Maurice LaMarche).
Ben awakens to learn that the Polecats have been duped into escorting Malcolm, and that an ambush is planned for them further up the road. He tries to catch up, but his motorcycle has been sabotaged, resulting in a fiery crash. He is rescued by young photographer Miranda (Pat Musick) and taken to the town of Melonweed, where he is treated by a mechanic named Maureen (Kath Soucie).
Maureen describes how her father taught her about motorcycles, and repairs Ben’s bike after he retrieves necessary parts, adding a booster to it as well. Ben catches up to the Polecats at a rest area, but is too late: Ripburger murders Malcolm and frames the Polecats for the crime. Miranda manages to catch the murder on film, but her camera is snatched by Bolus. Before dying, Malcolm tells Ben of Ripburger’s plan to take over Corley Motors and produce minivans instead of motorcycles. He reveals that Maureen is secretly his illegitimate daughter and begs Ben to convince her to take over the company. Bolus tries to kidnap Maureen, but she escapes with the film from Miranda’s camera.